Perhaps you should try some spelling variations:
trinh thuat » trinh luat, trinh thiet, trinh thuc
chieu sach » chinh sach, chiet tach, chieu sang
hieu quang » thieu quang, hieu quan, hieu qua
hanh trinh » canh tranh, hanh chinh
bang cong » dang cong, bang song, dung cong
hang cong » dang cong, hang nong, thanh cong
san thanh » ban thanh, van thanh, son thanh
thanh bac » nhanh bac, thanh bai, thanh san

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: ho ((chieu sach) OR (hieu quang)) - hanh trinh thuat ((bang cong) OR (hang cong)) san thanh bac~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho ((chieu sach) or (hieu quang)) - hanh trinh thuat ((bang cong) OR (hang cong)) san thanh bac~".
• Adding a wildcard symbol may retrieve word variants: ho ((chieu sach) or (hieu quang)) - hanh trinh thuat ((bang cong) OR (hang cong)) san thanh bac*.